ACOL Three Notrump Opening

An Opening bid of 3NT shows 16-21, a solid or semi-solid minor suit with at least 6-7 cards. Unlike Gambling 3NT, opener is expected to have stoppers in at least 2 (usually all 3) outside suits. Further, opener should not have void or singleton.

There is a defense to this convention, which is an extension of ASTRO.

• Double is for penalty
• 4 shows hearts and a minor. Partner bids 4 to run to the minor.
• 4 shows spades and another suit. Partner bids 4 to run to the other suit.
• All other suit bids are natural.